Release cli v1.19.0 · urfave/cli

FlagsByName was added to make it easy to sort flags (e.g. sort.Sort(cli.FlagsByName(app.Flags)))
A Description field was added to App for a more detailed description of
the application (similar to the existing Description field on Command)
Flag type code generation via go generate
Write to stderr and exit 1 if action returns non-nil error
Added support for TOML to the altsrc loader
SkipArgReorder was added to allow users to skip the argument reordering.
This is useful if you want to consider all "flags" after an argument as
arguments rather than flags (the default behavior of the stdlib flag
library). This is backported functionality from the removal of the flag
reordering in the unreleased version
2
For formatted errors (those implementing ErrorFormatter), the errors will
be formatted during output. Compatible with pkg/errors.

Consider empty environment variables as set (previously environment variables
with the equivalent of "" would be skipped rather than their value used).
Return an error if the value in a given environment variable cannot be parsed
as the flag type. Previously these errors were silently swallowed.
Print full error when an invalid flag is specified (which includes the invalid flag)
App.Writer defaults to stdout when nil
If no action is specified on a command or app, the help is now printed instead of panicing
App.Metadata is initialized automatically now (previously was nil unless initialized)
Correctly show help message if -h is provided to a subcommand
context.(Global)IsSet now respects environment variables. Previously it
would return false if a flag was specified in the environment rather than
as an argument
Removed deprecation warnings to STDERR to avoid them leaking to the end-user
altsrcs import paths were updated to use gopkg.in/urfave/cli.v1. This
fixes issues that occurred when gopkg.in/urfave/cli.v1 was imported as well
as altsrc where Go would complain that the types didn't match

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